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-rw-r--r--libguile/filesys.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/libguile/filesys.c b/libguile/filesys.c
index cccb39787..ae164fe83 100644
--- a/libguile/filesys.c
+++ b/libguile/filesys.c
@@ -1489,6 +1489,12 @@ SCM_DEFINE (scm_i_mkstemp, "mkstemp!", 1, 1, 0,
else
{
open_flags = scm_i_mode_to_open_flags (mode, &is_binary, FUNC_NAME);
+ /* mkostemp(2) only defines O_APPEND, O_SYNC, and O_CLOEXEC to be
+ useful, as O_RDWR|O_CREAT|O_EXCL are implicitly added. It also
+ notes that other flags may error on some systems, which turns
+ out to be the case. Of those flags, O_APPEND is the only one
+ of interest anyway, so limit to that flag. */
+ open_flags &= O_APPEND;
mode_bits = scm_i_mode_bits (mode);
}